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A fair coin with sides marked heads and tails is to be

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Joined: 03 Apr 2006
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A fair coin with sides marked heads and tails is to be [#permalink] New post 09 Jun 2007, 15:33
A fair coin with sides marked heads and tails is to be tossed eight times. What is the probability that the coin will land tails side up more than five times?

a) 37/256
b) 45/256
c)23/256
d) 70/ 256
e) 81/ 256
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 [#permalink] New post 09 Jun 2007, 15:53
(A)

t>5

i.e t = 6 or 7 or 8

prob(t=6) = 8C6 (1/2)^8

prob(t=7) = 8C7 (1/2)^8

prob(t=8) = 1

= 37/256
  [#permalink] 09 Jun 2007, 15:53
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A fair coin with sides marked heads and tails is to be

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